The traditional travel demand model usually bases itself on the od study survey and employs a 4-step modeling process including trip generation, trip distribution, mode choice and assignment.

传统的交通需求4阶段分析模型大多基于各类出行的起讫点调查(OD调查)，建立出行生成、出行分布、出行方式选择和流量分配的4阶段预测模式。

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Perform Step 4 if you have selected to import one or more subunits as model or root package.

如果您选择将一个或者多个子单元作为模型或者根包导入，那么可以继续到第4步。

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Normally we will choose some model components at all layers (Step 4).

通常，我们将在所有层中选择某些模型组件（步骤 4）。

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